It looks like I am going to replace my 8d's with a couple of group 31's. I intend to at least go with a sealed battery, but agm would be better, so when I saw a local deal on some Optima 31's, I was interested. The ratings on these batteries are 900 CCA and 1125 CA, which is comparable to other groups 31's. However, I noticed that the weight is only about 60 pounds while standard group 31's are about 75 pounds. Since I generally take weight as an indicator of power, I was wondering if anyone has any experience that would help me understand whether the Optima's would be as good, better, or worse than a standard 31.

As to the starting batteries, most regular wet batteries are also sealed now. We have size 31 sealed batteries that are 925cca for around $85.00. AGM's are the best battery, but also very expensive. Good Luck, TomC

I may go with Interstate's refurbished batteries. They are sealed, as TomC mentioned. They charge $50., and I think there is a one year replacement warranty. They will also pay extra for 8d's given as core. The local store (not really that local really) says he sells about 1500 of them a year and they last about 2 years on average, most of which is in commercial and equipment use.

One problem I found with Optiima is that their warranty is only supposed to be honored though the original seller. This does not make them great for travel. I would think that there would be less of an issue with Interstate.

I may go with Interstate's refurbished batteries. They are sealed, as TomC mentioned. They charge $50., and I think there is a one year replacement warranty. They will also pay extra for 8d's given as core. The local store (not really that local really) says he sells about 1500 of them a year and they last about 2 years on average, most of which is in commercial and equipment use.

Warning! Don't do it!

BTDT, completely wasted my money and time. I went through two warrenty exchanges and decided it was not worth it. If you are selling and wish to kick the can to the new owner, then that's what they are good for. If you are keeping it, then buy new and take as good of care your batteries as possible. If you still think you will beat the odds, at least take a refractometer with you and find the best ones you can. This is a classic case of spending less now to spend even more later.

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L. Christley - W3EYE Amateur ExtraBlue Ridge Mountains, S.W. VirginiaItís the education gained, and the ability to apply, and share, what we learn.Have fun, be great, that way you have Great Fun!

I almost forgot to mention this. There is no such thing as a refurbished battery. Interstate only cleans the case, puts it on charge, and if holds, will sell it as "Refurbished" to the gullible. Take some time and search for the used battery threads.

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L. Christley - W3EYE Amateur ExtraBlue Ridge Mountains, S.W. VirginiaItís the education gained, and the ability to apply, and share, what we learn.Have fun, be great, that way you have Great Fun!